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      1 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 // Implementation of the byte-level differential compression used internally by
      6 // Courgette.
      7 
      8 #include "courgette/simple_delta.h"
      9 
     10 #include "base/basictypes.h"
     11 #include "base/logging.h"
     12 
     13 #include "courgette/third_party/bsdiff.h"
     14 
     15 namespace courgette {
     16 
     17 namespace {
     18 
     19 Status BSDiffStatusToStatus(BSDiffStatus status) {
     20   switch (status) {
     21     case OK: return C_OK;
     22     case CRC_ERROR: return C_BINARY_DIFF_CRC_ERROR;
     23     default: return C_GENERAL_ERROR;
     24   }
     25 }
     26 
     27 }
     28 
     29 Status ApplySimpleDelta(SourceStream* old, SourceStream* delta,
     30                         SinkStream* target) {
     31   return BSDiffStatusToStatus(ApplyBinaryPatch(old, delta, target));
     32 }
     33 
     34 Status GenerateSimpleDelta(SourceStream* old, SourceStream* target,
     35                            SinkStream* delta) {
     36   VLOG(1) << "GenerateSimpleDelta " << old->Remaining()
     37           << " " << target->Remaining();
     38   return BSDiffStatusToStatus(CreateBinaryPatch(old, target, delta));
     39 }
     40 
     41 }  // namespace courgette
     42